Surface treatment of opening rollers for open end spinning

Abstract

A process for surface treatment and wear resistant coating of opening rollers for open end spinning of the type having a basic metallic body and a raw wire clothing, includes the steps of introducing the opening roller into a sealing bath in such a way that this sealing bath fills even the smallest voids between the raw wire and the basic body of the roller, rinsing off the opening roller clean on the outside, heat treating the opening roller, and subjecting the opening roller thus pretreated to deburring and antiwear coating in a conventional manner.

What is claimed is: 
     
       1. A surface treatment process for minimizing corrosion due to voids existing between the basic metallic-body of an opening roller for open end spinning and a raw wire clothing mounted thereon comprising prior to deburring and application of an antiwear coating, the steps of: a) introducing the opening roller into a bath comprising a sealing material in such a way that said sealing material is deposited in and on the walls of the voids existing between the raw wire and the basic body of the roller; said sealing material being selected from the group consisting of silicates, phosphates mixtures thereof;   b) rinsing the sealing material from an outer surface of the opening roller to form a rinsed opening roller;   c) heat treating the rinsed opening roller to produce a pretreated opening roller at temperatures sufficient to (i) evaporate any solvent from the sealing material and to (ii) harden the sealing material so as to prevent attack on such material during deburring and coating, and   then deburring and applying an antiwear coating to the pretreated opening roller.   
     
     
       2. The process of claim 1, wherein the sealing bath comprises a sealing material which on drying forms an unbroken insoluble film. 
     
     
       3. The process of claim 2, wherein the sealing bath comprises an aqueous solution. 
     
     
       4. The process of claim 1 wherein step a) is carried out under superatmospheric pressure in a closed dip vessel. 
     
     
       5. A process according to claim 1, further comprising the step of removing residual moisture from gaps between said basic body and said raw wire clothing after rinsing and before heat treating the opening roller. 
     
     
       6. The process of claim 6, wherein said step of removing the residual moisture includes the step of passing said opening roller through an oven maintained at a temperature to remove the residual moisture. 
     
     
       7. The process of claim 1, wherein the opening roller is heated and the heated roller is introduced into the sealing bath. 
     
     
       8. The process of claim 1, wherein said step of rinsing the sealing material from the outer surface of the opening roller includes a step of dipping said opening roller into at least one tank filled with water at room temperature. 
     
     
       9. The process of claim 1, further including the step of cooling said pretreated opening roller after heat treating and before deburring and anti-wear coating the pretreated opening roller. 
     
     
       10. The process of claim 1, wherein the opening roller comprises an aluminum or steel body and steel wire clothing and wherein prior to deburring, said rollers is subjected to a hot degreasing followed by an acidic pickle to remove an oxide film from steel surfaces thereof, and wherein after deburring, said rollers is subjected to a further pickle to activate the steel surfaces thereof, followed by treating said opening roller to activate aluminum surfaces thereof for chemical nickelization. 
     
     
       11. The process of claim 1, wherein said deburring includes subjecting said pretreated opening roller to a chemical deburring bath to remove sharp edges of teeth of the raw wire clothing.